Commitment needs to be nutured and be rewarded during the process of achieving the goal.
The difficulty level of each goal can push one to motivate himself or herself with expectations when one see that he or she is nearer to the goal each day.Most important is to keep realistic commitment so that it can see one thru during the process and the time and effort that has been put in .
It cant be just commitment without passion in achieving the baby steps towards the big goal. So passion must be included. Find the passion and you will find commitment.